Ch. 18-19: Oceans

Which type of ocean pollution is caused by agriculture, deforestation & construction?

• a. solid-waste pollution

• b. sewage pollution

• c. sediment pollution

#1

At a mid-ocean ridge, what is the next step after the ocean

plates separate?

• a. Hot magma seeps through the

cracks

• b. water cools the lava

• c. a trench forms

#2

Oil, natural gas, sand, metals, and diamonds are

mined from deposits found in ___________.

• a. Continental

shelves

• b. Deep water deposits

• c. Ocean trenches

#3

Algal blooms are caused by ____________.

• a. sewage

• b. Oil spills

• c. silt

#4

The mid-ocean ridge is an underwater mountain range that forms from ________.

• a. a transform boundary

• b. subduction zone

• c. seafloor spreading

#5

A _________ forms when one oceanic crust plate

sinks beneath another at a subduction zone.

• a. seamount

• b. mid-ocean ridge

• c. rift valleys

#6

Sediment settles constantly on the ocean floor and these

deposits fill in valleys and create flat seafloor areas called

___________.

• a. continental slopes

• b. submarine canyons

• C. abyssal plains

#7

The largest source of oil pollution in the ocean is ________.

• a. Runoff from land

• b. Offshore drilling

• c. Shipping

#8

Most ocean pollution comes from ____________.

• a. fish

• b. land

• c. ships

#9

Which type of ocean pollution acts like a fertilizer and causes algae to outgrow and eventually kill coral?

• a. oil pollution

• b. sewage

• c. chemical pollution

#10

The place where new ocean floor forms is called a(n)

___________.

• a. abyssal plain

• b. mid-ocean ridge

• c. trench

#11

Which type of ocean pollution includes the carrying of

herbicides, insecticides & industrial waste by streams into

the oceans?

• a. chemical pollution

• b. oil pollution

• c. sewage

#12

A relatively flat but gradually sloping end of a continent

that extends under the ocean

• a. Abyssal plain

• b. Continental slope

• c. Continental shelf

• d. Seamount

#13

The deepest place in the Pacific Ocean

• a. Abyssal plain

• b. Mariana Trench

• c. Continental shelf

• d. mid-ocean ridge

#14

The area in an ocean basin where new ocean floor is

formed

• a. Abyssal plain

• b. ocean trench

• c. seamount

• d. mid-ocean ridge

#15

Flat seafloor areas

• a. Abyssal plain

• b. ocean trench

• c. seamount

• d. mid-ocean ridge

#16

A long, narrow, steep-sided depression where one plate

sinks beneath another

• a. Abyssal plain

• b. ocean trench

• c. seamount

• d. mid-ocean ridge

#17

Underwater, inactive volcano peaks

• a. Abyssal plain

• b. ocean trench

• c. seamount

• d. mid-ocean ridge

#18

The steep area that extends from the outer edge of the

continental shelf down to the ocean floor

• a. Abyssal plain

• b. continental cliff

• c. continental plain

• d. continental slope

#19

In the picture, the right angle position of the Earth, Moon, and Sun result in __________.

• a. a spring tide

• b. a neap tide

• c. no tides

• d. high tides everywhere

#20

Which of the following is NOT a method of desalinating ocean

water?

• a. Filtering through a membrane

• b. Freezing ocean water

• c. Using a solar powered

plant• d. Melting

glaciers

#21

Tides are affected by the positions of __________.

• a. Earth, Sun, and Mars

• b. Venus, Earth, and Mars

• c. Earth and Moon only

• d. Earth, Moon, and Sun

#22

In the picture, the positions of the Earth, Moon, and Sun are aligned. This creates _________.

• a. a spring tide

• b. a neap tide

• c. no tides

• d. high tides everywhere

#23

In which direction does the Coriolis Effect cause currents in the northern

hemisphere to turn?

• a. clockwise

• b.counterclockwise

• c. north

• d. south

#24

What is the direction of ocean currents in the southern hemisphere?

• a. clockwise

• b.counterclockwise

• c. north

• d. south

#25

Which of the following is a reasonable conclusion based on the information in the picture?

• a. The Pacific

Ocean is deep

• b. The oceans’ currents only flow in

one direction

• c. The oceans’ waters are

constantly in motion• d. The North Equatorial current flows east to west

#26

Deep down in the cold ocean depths, currents circulate

because of __________.

• a. density differences

• b. wind blowing

• c. polar ice caps melting

• d. geography

#27

Most waves form because of ___________.

• a. the Coriolis Effect

• b. winds blowing across the water’s

surface transfer their energy to the water

• c. the salinity of ocean water

• d. none of the above.

#28

Which of the following could increase the ocean’s salinity?

• a. Decrease precipitation and

little warmth

• b. More water entering the

oceans

• c. More water evaporating

leaving the salt behind

• d. Polar ice caps melting

#29

The Gulf Stream starts near the __________ and carries _________

water up the east coast of the United States.

• a. north pole, cold

• b. north pole, warm

• c. equator, warm

• d. equator, cold

#30

Which statement provides the best description of why a

wave breaks?

• a. The top of the wave moves faster

than the bottom

• b. The wind pushes the top

of the wave over

• c. The bottom of the wave moves faster than the top

• d. The top of the wave has a greater

concentration of salt than the bottom

#31

________ is measured by the distance between a crest and

a crest or a trough and a trough.

• a. amplitude

• b. frequency

• c. wave height

• d. wavelength

#32

What causes most surface currents to start moving?

• a. The Gulf Stream

• b. density differences

• c. wind

• d. salinity

#33

A wave is a rhythmic movement that carries ______

through matter or space.

• a. energy

• b. water particles

• c. heat

• d. salt

#34

Which of the following terms is used to describe the amount of

dissolved salts in seawater?

• a. density

• b. salinity

• c. buoyancy

• d.temperature

#35